

class Container {
    static of(value){
        return new Container(value)
    }

    constructor(value){
        this._value = value
    }

    map(fn) {
        return Container.of(fn(this._value))
    }
}

class Maybe {
    static of(x){
        return new Maybe(x)
    }
    isNothing(){
        return this._value === null ||
        this._value === undefined
    }

    constructor(x){
        this._value = x
    }

    map(fn){
        return this.isNothing() ? this : Maybe.of(fn(this._value))
    }
}


export {
    Container,
    Maybe,
}
